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//
// main.cpp
// 13
//
// Created by Aurimas on 15/01/2019.
// Copyright © 2019 Aurimas. All rights reserved.
//
#include <iostream>
#include <cmath>
#include <cstdlib>
#include "simpson.h"
#include "pratimas13_f1.h"
#include "pratimas13_f2.h"
// deklaruoju pagalbines funkcijas
void text();
void spresti_funkcija(double (*funk) (double x));
char setchar(void);
void clear(void);
int minimeniu(void);
int main()
{
// hack'as: kad visada butu panasiai centruotas menu
// pirma atspausdinu tusciu liniju
clear();
text();
for (;;)
{
char r = setchar();
switch(r)
{
case 'x':
{
return 0;
}
case 'c':
{
clear();
text();
}
case 'f':
{
int a = 1;
while(a)
{
spresti_funkcija(f1);
printf("\n");
// 1 arba 0
a = minimeniu();
printf("\n");
}
clear();
text();
break;
}
case 's':
{
int a = 1;
while(a)
{
spresti_funkcija(f2);
printf("\n");
// 1 arba 0
a = minimeniu();
printf("\n");
}
clear();
text();
break;
}
default:
{
printf("\n\n");
}
}
}
}
// ***********************************************
void text()
{
printf("Meniu \r\n\n");
printf("Kokią funkciją norite integruoti?\n");
printf("f(x) = x - spauskite f\n");
printf("f(x) = x^2 - spauskite s\n");
printf("Išeiti iš meniu - spauskite x\n");
for (int i = 1; i < 5; i++)
printf("\n");
}
// ********************************************
void spresti_funkcija(double (*funk) (double x))
{
double a,b,f;
int n;
// Duomenys -------------------------------
printf("a = ");
// a, b, n jau deklaruoti, scanf reikia zinoti tik jo adresa
scanf("%lf", &a);
printf("b = ");
scanf("%lf", &b);
printf("n = ");
scanf("%d", &n);
// isvalo nuo susikaupusio "return" zenklo stinput
while (getchar() != '\n');
// ----------------------------------------
f = simpson(funk,a,b,n); // Integralas
// Rezultatas -----------------------------
printf("Integralas = %.3lf\n",f);
}
// ********************************************
char setchar(void)
// only get the first char
// using it consistently throughout the code
// will prevent the issue of reading "return"
{
char c = setchar();
while (setchar() != '\n');
return c;
}
// ********************************************
void clear(void)
// hack to "clear" screen by printing empty lines
{
for (int i = 0; i < 100; i++)
{
printf("\n");
}
}
// ********************************************
int minimenu(void)
// require the user to either enter 'x' or 'p'
// returns 0 or 1, respectively
{
for (;;)
{
printf("p - Spreskite funkcija \n x - Atgal i meniu \n");
char c = setchar();
switch(c)
{
case 'p':
return 1;
break;
case 'x':
return 0;
break;
}
}
}
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